/*
==========================================================================
SOTA PORTFOLIO - STYLE.CSS
This is the single source of truth for all styles on the website.
Editing this file will change the design of index.html, all blog posts,
and any other page you create. This is the core of maintainability.
==========================================================================
*/

/* 
========================================
1.  DESIGN SYSTEM (CSS VARIABLES)
========================================
*/
:root {
    /* Color Palette */
    --color-primary: #00a8a8;
    --color-primary-light: #52d9d9;
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;

    /* Typography */
    --font-family-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    --font-family-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    --font-size-base: 16px;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-xxl: 1.5rem;
    --font-size-display: 3rem;
    --font-weight-regular: 400;
    --font-weight-bold: 700;
    --line-height-base: 1.6;

    /* Spacing & Sizing */
    --spacing-unit: 1rem;
    --container-width: 1100px;
    --blog-content-width: 720px;
    --header-height: 60px;

    /* Borders & Shadows */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --box-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --box-shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --box-shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.2), 0 10px 10px -5px rgba(0,0,0,0.1);

    /* Transitions */
    --transition-duration: 300ms;
    --transition-timing: ease-in-out;
}

/* 
========================================
2.  GLOBAL STYLES & RESETS
========================================
*/
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + var(--spacing-unit)); }
body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, h4, h5, h6 { font-weight: var(--font-weight-bold); line-height: 1.2; color: var(--color-text-primary); margin-bottom: var(--spacing-unit); }
h1 { font-size: var(--font-size-display); }
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-xl); }
p { color: var(--color-text-secondary); margin-bottom: var(--spacing-unit); }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-duration) var(--transition-timing); }
a:hover { color: var(--color-primary-light); }
img { max-width: 100%; display: block; }


/* 
========================================
3.  LAYOUT & SHARED COMPONENTS
========================================
*/
.container { max-width: var(--container-width); margin: 0 auto; padding: 0 var(--spacing-unit); }
.section { padding: calc(var(--spacing-unit) * 4) 0; }
.section-title { text-align: center; margin-bottom: calc(var(--spacing-unit) * 3); position: relative; }
.section-title::after { content: ''; position: absolute; bottom: -10px; left: 50%; transform: translateX(-50%); width: 60px; height: 4px; background-color: var(--color-primary); border-radius: 2px; }

/* Navbar */
.navbar { position: fixed; top: 0; left: 0; right: 0; height: var(--header-height); background-color: rgba(30, 41, 59, 0.8); backdrop-filter: blur(10px); z-index: 1000; border-bottom: 1px solid var(--color-border); }
.navbar .container { display: flex; justify-content: space-between; align-items: center; height: 100%; }
.nav-logo { font-weight: var(--font-weight-bold); font-size: var(--font-size-xl); color: var(--color-text-primary); }
.nav-menu { display: flex; list-style-type: none; gap: calc(var(--spacing-unit) * 2); }
.nav-link { color: var(--color-text-secondary); font-weight: var(--font-weight-bold); transition: color var(--transition-duration) var(--transition-timing); }
.nav-link:hover, .nav-link.active { color: var(--color-primary); }

/* Hero Section */
#hero { display: flex; align-items: center; justify-content: center; min-height: 100vh; text-align: center; }
#hero h1 { margin-bottom: 0.5rem; }
#hero h1 .highlight { color: var(--color-primary); }
#hero .subtitle { font-size: var(--font-size-xl); color: var(--color-text-secondary); margin-bottom: calc(var(--spacing-unit) * 2); }

/* Buttons */
.btn { display: inline-block; padding: 0.75rem 1.5rem; border-radius: var(--border-radius-md); font-weight: var(--font-weight-bold); text-align: center; transition: all var(--transition-duration) var(--transition-timing); cursor: pointer; border: 1px solid transparent; }
.btn-primary { background-color: var(--color-primary); color: var(--color-background); border-color: var(--color-primary); }
.btn-primary:hover { background-color: var(--color-primary-light); border-color: var(--color-primary-light); color: var(--color-background); transform: translateY(-3px); box-shadow: var(--box-shadow-md); }
.btn-secondary { background-color: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-secondary:hover { background-color: var(--color-primary); color: var(--color-background); }

/* Grid & Cards (For Projects & Blog) */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: calc(var(--spacing-unit) * 2); }
.card { background-color: var(--color-surface); border-radius: var(--border-radius-md); overflow: hidden; border: 1px solid var(--color-border); box-shadow: var(--box-shadow-sm); transition: transform var(--transition-duration) var(--transition-timing), box-shadow var(--transition-duration) var(--transition-timing); display: flex; flex-direction: column; }
.card:hover { transform: translateY(-10px); box-shadow: var(--box-shadow-lg); border-color: var(--color-primary); }
.card-image { width: 100%; height: 200px; object-fit: cover; background-color: var(--color-border); }
.card-content { padding: calc(var(--spacing-unit) * 1.5); flex-grow: 1; display: flex; flex-direction: column; }
.card-title { margin-bottom: calc(var(--spacing-unit) * 0.5); color: var(--color-text-primary); }
.card-description { color: var(--color-text-secondary); flex-grow: 1; }
.card-tags { margin-top: var(--spacing-unit); display: flex; flex-wrap: wrap; gap: calc(var(--spacing-unit) * 0.5); }
.tag { background-color: rgba(0, 168, 168, 0.1); color: var(--color-primary); padding: 0.25rem 0.75rem; border-radius: var(--border-radius-sm); font-size: 0.8rem; font-weight: var(--font-weight-bold); }
.card-footer { padding: 0 calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 1.5); display: flex; gap: var(--spacing-unit); margin-top: auto; }
.card-link-wrapper { display: block; color: inherit; text-decoration: none; } /* Wrapper for clickable blog cards */

/* About Section */
#about .container { display: flex; gap: calc(var(--spacing-unit) * 3); align-items: center; }
#about-image { width: 250px; height: 250px; object-fit: cover; border-radius: 50%; border: 5px solid var(--color-surface); box-shadow: 0 0 20px rgba(0, 168, 168, 0.2); flex-shrink: 0; }
#about-text { flex: 1; }

/* Contact Section */
#contact p { text-align: center; font-size: var(--font-size-lg); max-width: 600px; margin-left: auto; margin-right: auto; margin-bottom: calc(var(--spacing-unit) * 2); }
#contact .container { text-align: center; }

/* Footer */
.footer { text-align: center; padding: calc(var(--spacing-unit) * 2) 0; margin-top: calc(var(--spacing-unit) * 4); border-top: 1px solid var(--color-border); }
.footer p { color: var(--color-text-secondary); margin: 0; }

/* 
========================================
4.  BLOG POST SPECIFIC STYLES
========================================
*/
.blog-post { padding-top: calc(var(--header-height) + var(--spacing-unit) * 3); }
.blog-post-container { max-width: var(--blog-content-width); margin: 0 auto; padding: 0 var(--spacing-unit); }
.blog-header { text-align: center; margin-bottom: calc(var(--spacing-unit) * 3); }
.blog-title { color: var(--color-text-primary); margin-bottom: var(--spacing-unit); }
.blog-meta { color: var(--color-text-secondary); font-size: var(--font-size-lg); margin-bottom: calc(var(--spacing-unit) * 1.5); }
.blog-tags { display: flex; justify-content: center; gap: calc(var(--spacing-unit) * 0.5); }
.blog-content h2, .blog-content h3 { margin-top: calc(var(--spacing-unit) * 2.5); margin-bottom: var(--spacing-unit); color: var(--color-text-primary); border-bottom: 1px solid var(--color-border); padding-bottom: 0.5rem; }
.blog-content p { font-size: var(--font-size-lg); color: var(--color-text-secondary); line-height: 1.7; margin-bottom: var(--spacing-unit) }
.blog-content a { text-decoration: underline; text-underline-offset: 4px; }
.blog-content img { border-radius: var(--border-radius-md); margin: calc(var(--spacing-unit) * 2) 0; box-shadow: var(--box-shadow-sm); }
.blog-content blockquote { margin: calc(var(--spacing-unit) * 1.5) 0; padding-left: calc(var(--spacing-unit) * 1.5); border-left: 4px solid var(--color-primary); font-style: italic; color: var(--color-text-secondary); }
.blog-content ul, .blog-content ol { margin-left: calc(var(--spacing-unit) * 1.5); margin-bottom: var(--spacing-unit); color: var(--color-text-secondary); font-size: var(--font-size-lg); line-height: 1.7; }
.blog-content li { margin-bottom: calc(var(--spacing-unit) * 0.5); }
.blog-content pre { background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--border-radius-md); padding: var(--spacing-unit); overflow-x: auto; margin: calc(var(--spacing-unit) * 1.5) 0; font-family: var(--font-family-mono); font-size: 0.9rem; }
.blog-content code { font-family: var(--font-family-mono); background-color: var(--color-surface); padding: 0.2em 0.4em; border-radius: var(--border-radius-sm); }
.blog-content pre code { background: none; padding: 0; font-size: inherit; border-radius: 0; }
.blog-footer { margin-top: calc(var(--spacing-unit) * 4); text-align: center; }

/* 
========================================
5.  ANIMATIONS & RESPONSIVE
========================================
*/
.fade-in-up { opacity: 0; transform: translateY(20px); transition: opacity 0.6s var(--transition-timing), transform 0.6s var(--transition-timing); }
.fade-in-up.visible { opacity: 1; transform: translateY(0); }
.grid .card { transition-delay: calc(var(--stagger-index) * 100ms); }

@media (max-width: 768px) {
    :root { --font-size-display: 2rem; --font-size-xxl: 1.5rem; }
    .nav-menu { display: none; } /* Simplification for hamburger menu */
    #about .container { flex-direction: column; text-align: center; }
}